/Engine/Plugins/Runtime/AudioSynesthesia/Source/AudioSynesthesiaCore/Public/ConstantQAnalyzer.h
The Constant Q Analyzer computs a pseudo constant q transform of the input audio. ConstantQ transforms produce frequency strength at logarithmically spaced frequency intervals (as opposed to the linearly spaced intervals of the FFT). Logarithmically spaced frequency intervals map nicely to musical scales.
class FConstantQAnalyzer